Synthesis and applications of cyano‐vinylene‐based polymers containing cyclopentadithiophene and dithienosilole units for photovoltaic cells |
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Authors: | Harihara Padhy Duryodhan Sahu Dhananjaya Patra Murali Krishna Pola Jen‐Hsien Huang Chih‐Wei Chu Kung‐Hwa Wei Hong‐Cheu Lin |
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Institution: | 1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan, Republic of China;2. Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan, Republic of China;3. Department of Photonics, National Chiao Tung University, Hsinchu, Taiwan, Republic of China |
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Abstract: | Two β‐cyano‐thiophenevinylene‐based polymers containing cyclopentadithiophene ( CPDT‐CN ) and dithienosilole ( DTS‐CN ) units were synthesized via Stille coupling reaction with Pd(PPh3)4 as a catalyst. The effects of the bridged atoms (C and Si) and cyano‐vinylene groups on their thermal, optical, electrochemical, charge transporting, and photovoltaic properties were investigated. Both polymers possessed the highest occupied molecular orbital (HOMO) levels of about ?5.30 eV and the lowest unoccupied molecular orbital (LUMO) levels of about ?3.60 eV, and covered broad absorption ranges with narrow optical band gaps (ca. 1.6 eV). The bulk heterojunction polymer solar cell (PSC) devices containing an active layer of electron‐donor polymers ( CPDT‐CN and DTS‐CN ) blended with an electron‐acceptor, that is, 6,6]‐phenyl‐C61‐butyric acid methyl ester (PC61BM) or 6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM), in different weight ratios were explored under 100 mW/cm2 of AM 1.5 white‐light illumination. The PSC device based on DTS‐CN: PC71BM (1:2 w/w) exhibited a best power conversion efficiency (PCE) value of 2.25% with Voc = 0.74 V, Jsc = 8.39 mA/cm2, and FF = 0.36. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011. |
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Keywords: | conjugated polymers copolymerization donor‐acceptor heteroatom‐containing polymers solar cells |
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